Economic 'collapse'

There was also unrest in 12 out of 27 of Egypt's provinces. At least six of the deaths occurred in Suez.

In Ismailia, protesters set fire to the headquarters of the Freedom and Justice Party, the political arm of the Muslim Brotherhood. The city's governorate headquarters was later also stormed.

The liberal opposition accuses Mr Morsi of being autocratic and driving through a new constitution that does not protect adequately freedom of expression or religion.

The government is also being blamed for a deepening economic crisis.

One of the demonstrators at Cairo's Tahrir Square, Momen Asour, said he had come to demand an end to President Morsi's rule.

"We have not seen anything, Neither freedom, nor social justice, or any solution to unemployment, or any investment," he said. "On the contrary, the economy has collapsed."

President Morsi and his allies have dismissed the claim, saying they have a democratic mandate following recent elections. The constitution, drawn up by an Islamist-dominated body, was approved by referendum last month.